The new Worldwide Harmonised Light Vehicle Test Procedure (WLTP) standard of measuring fuel consumption and CO2 emissions in passenger cars is being introduced from Jan 2019. It is a more accurate measure of a vehicles performance than the outgoing NEDC (New European driving cycle) system which remains in place as a measure of CO2 for taxation purposes until April 2020. For more information see our website. A guide to fuel economy and CO2 emissions which contains data for all new passenger car models is available at any point of sale free of charge. In addition to the fuel efficiency of a car, driving behaviour as well as other non-technical factors play a role in determining a car’s fuel consumption and CO2 emissions. CO2 is the main greenhouse gas responsible for global warming